On Mon, Aug 17, 2020 at 5:02 PM Marco Sulla <marco.sulla.pyt...@gmail.com> wrote:
> On Mon, 17 Aug 2020 at 11:17, Steven D'Aprano <st...@pearwood.info> wrote: > > Did you have a specific question to be answered or are you just hoping > > to get people interested in the proposal? > > It seems I have to repost the proposal I already wrote... > My proposal is to add a way for third party modules to add custom > keywords. You can already do something like this, using either an import hook or a custom encoding. Perhaps I should repost a link that I already included in an earlier, but rather terse, reply on this thread, about the specific "constant" example. See: https://aroberge.github.io/ideas/docs/html/ You will find various examples of adding custom keywords. (more below) > Example: > > from mykeywords import @const > @const a = 1 > > Notice that I choose "@" but I hope another non c-alphanumeric > character will be chosen. > > On Mon, 17 Aug 2020 at 12:46, Chris Angelico <ros...@gmail.com> wrote: > > A proposal that requires syntactic changes [...] > > No syntactic changes are needed. Custom keywords *must* be prefixed > with a non-alphanumeric character (@ for example). > Syntactic changes would be needed. The way that your example would be normally processed by Python is as follows: First, the entire content of the file would be read, and broken up into tokens (individual words and symbols). Next, these tokens would be interpreted according to Python's grammar: your notation would raise a SyntaxError. This would stop the entire process. To actually do the import "from mykeywords import ...", one needs to go beyond the parsing stage. This is where a custom encoding or an import hook can help, by transforming the source into valid Python code before it is parsed. More information available at the link given above. André Roberge > > > ACK > _______________________________________________ > Python-ideas mailing list -- python-ideas@python.org > To unsubscribe send an email to python-ideas-le...@python.org > https://mail.python.org/mailman3/lists/python-ideas.python.org/ > Message archived at > https://mail.python.org/archives/list/python-ideas@python.org/message/NUAHVSON3HTHNEZ7GBCI3R6XE4RSSSZP/ > Code of Conduct: http://python.org/psf/codeofconduct/ >
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